DON'T DO THIS:
the offending code probably was:
add(new Label("id", new PropertyModel(getSession(), "someProperty")));
This hard links the session to the page, and causes a cycle when serializing.
Martijn
On Tue, Nov 16, 2010 at 6:59 PM, jcgarciam <[email protected]> wrote:
>
> Douglas, can you share any insight of how having the session in the property
> model could actually provoke this leak?
>
> It seems weird.
>
> On Tue, Nov 16, 2010 at 2:56 PM, Igor Vaynberg-2 [via Apache Wicket] <
> [email protected]<ml-node%[email protected]>
>> wrote:
>
>> it is perfectly valid to use page as the model object. in fact if you
>> wanted to pull something out of session you can simply say new
>> PropertyModel(this, "session.property"), this being the Page instance
>> you are in.
>>
>> -igor
>>
>> On Tue, Nov 16, 2010 at 9:46 AM, Douglas Ferguson
>> <[hidden email] <http://user/SendEmail.jtp?type=node&node=3045359&i=0>>
>> wrote:
>>
>> > We found it.. Finally!!!
>> >
>> > There was a property model that was using the session as the model
>> object.
>> >
>> > It would be cool if PropertyModel, etc would check for this and blow up
>> on construction.
>> > i.e. not allow Page, Session, Application as the model object...
>> >
>> > D/
>> > On Nov 16, 2010, at 11:20 AM, Douglas Ferguson wrote:
>> >
>> >> Just tested on 1.4.13 and it still happens
>> >>
>> >> On Nov 16, 2010, at 9:43 AM, Douglas Ferguson wrote:
>> >>
>> >>> 1.4.12, but the problem has been around since a few versions back.
>> >>>
>> >>> D/
>> >>>
>> >>> On Nov 16, 2010, at 12:43 AM, Martijn Dashorst wrote:
>> >>>
>> >>>> Are you using 1.4.13?
>> >>>>
>> >>>> Martijn
>> >>>>
>> >>>> On Tue, Nov 16, 2010 at 5:54 AM, Douglas Ferguson
>> >>>> <[hidden email]<http://user/SendEmail.jtp?type=node&node=3045359&i=1>>
>> wrote:
>> >>>>> Some time ago I posted to the list regarding a stack overflow error
>> that I was receiving and the advice was to make sure that I didn't have a
>> page storing a reference to another page.
>> >>>>> We did track this down and have just had to ignore it in the
>> production logs. Now we've made it a priority to track this down.
>> >>>>>
>> >>>>> Anyway, we've recently tracked this down to
>> "AutomaticMultiWindowSupport" feature. We are able to recreate the bug by
>> pasting a url into a new browser window and thus generating a new pagemap.
>> On a certain page the memory consumption doubles as you generate new
>> pagemaps (see the chart below). The profile is indicating that the memory is
>> being taken up by a hashmap, but that's as far as we've been able to trace
>> it so far.
>> >>>>>
>> >>>>>> PageMap # Size Growth
>> >>>>>> 13 389523448 1.93
>> >>>>>> 12 202059096 1.93
>> >>>>>> 11 104804096 1.93
>> >>>>>> 10 54352280 1.93
>> >>>>>> 9 28182760 1.93
>> >>>>>> 8 14594976 1.93
>> >>>>>> 7 7549336 1.94
>> >>>>>> 6 3900704 1.94
>> >>>>>> 5 2013480 2
>> >>>>>> 4 1006960 2
>> >>>>>> 3 503696 2
>> >>>>>> 2 252072 1.86
>> >>>>>> 1 135704
>> >>>>>
>> >>>>>
>> >>>>> Any thoughts or tips on trying to get to the bottom of this one?
>> >>>>>
>> >>>>> Here's the stack trace
>> >>>>>
>> >>>>>> at sun.reflect.GeneratedMethodAccessor42.invoke(Unknown Source)
>> >>>>>> at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown
>> Source)
>> >>>>>> at java.lang.reflect.Method.invoke(Unknown Source)
>> >>>>>> at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown
>> Source)
>> >>>>>> at java.io.ObjectOutputStream.writeObject0(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.writeObject(Unknown Source)
>> >>>>>> at java.util.LinkedList.writeObject(Unknown Source)
>> >>>>>> at sun.reflect.GeneratedMethodAccessor40.invoke(Unknown Source)
>> >>>>>> at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown
>> Source)
>> >>>>>> at java.lang.reflect.Method.invoke(Unknown Source)
>> >>>>>> at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown
>> Source)
>> >>>>>> at java.io.ObjectOutputStream.writeObject0(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
>>
>> >>>>>> at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown
>> Source)
>> >>>>>> at java.io.ObjectOutputStream.writeObject0(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
>>
>> >>>>>> at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown
>> Source)
>> >>>>>> at java.io.ObjectOutputStream.writeObject0(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
>>
>> >>>>>> at java.io.ObjectOutputStream.defaultWriteObject(Unknown Source)
>>
>> >>>>>> at org.apache.wicket.Component.writeObject(Component.java:4660)
>> >>>>>> at sun.reflect.GeneratedMethodAccessor38.invoke(Unknown Source)
>> >>>>>> at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown
>> Source)
>> >>>>>> at java.lang.reflect.Method.invoke(Unknown Source)
>> >>>>>> at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown
>> Source)
>> >>>>>> at java.io.ObjectOutputStream.writeObject0(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.writeArray(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.writeObject0(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
>>
>> >>>>>> at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown
>> Source)
>> >>>>>> at java.io.ObjectOutputStream.writeObject0(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.writeArray(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.writeObject0(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
>>
>> >>>>>> at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown
>> Source)
>> >>>>>> at java.io.ObjectOutputStream.writeObject0(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.writeArray(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.writeObject0(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
>>
>> >>>>>> at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown
>> Source)
>> >>>>>> at java.io.ObjectOutputStream.writeObject0(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.writeArray(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.writeObject0(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
>>
>> >>>>>> at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown
>> Source)
>> >>>>>> at java.io.ObjectOutputStream.writeObject0(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.writeArray(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.writeObject0(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
>>
>> >>>>>> at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown
>> Source)
>> >>>>>> at java.io.ObjectOutputStream.writeObject0(Unknown Source)
>> >>>>>> at java.io.ObjectOutputStream.writeObject(Unknown Source)
>> >>>>>> at
>> org.apache.wicket.util.io.IObjectStreamFactory$DefaultObjectStreamFactory$2.writeObjectOverride(IObjectStreamFactory.java:121)
>>
>> >>>>>> at java.io.ObjectOutputStream.writeObject(Unknown Source)
>> >>>>>> at
>> org.apache.wicket.util.lang.Objects.objectToByteArray(Objects.java:1124)
>> >>>>>> at
>> org.apache.wicket.protocol.http.pagestore.AbstractPageStore.serializePage(AbstractPageStore.java:203)
>>
>> >>>>>> at
>> org.apache.wicket.protocol.http.pagestore.DiskPageStore.prepareForSerialization(DiskPageStore.java:1190)
>>
>> >>>>>> at
>> org.apache.wicket.protocol.http.SecondLevelCacheSessionStore$SecondLevelCachePageMap.writeObject(SecondLevelCacheSessionStore.java:389)
>>
>> >>>>>
>> >>>>>
>> >>>>>
>> >>>>>
>> >>>>
>> >>>>
>> >>>>
>> >>>> --
>> >>>> Become a Wicket expert, learn from the best:
>> http://wicketinaction.com <http://wicketinaction.com?by-user=t>
>> >>>>
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>> >>>>
>> >>>
>> >>
>> >
>> >
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>
>
> --
> Sincerely,
> JC (http://www.linkedin.com/in/jcgarciam)
> Work smarter, not harder!.
>
> --
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